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{"ops":[{"insert":"The lifespan of rats raised in a laboratory is approximately normally distributed with a standard deviation of 5.9 months. A sample of 31 rats reared to adulthood in a laboratory have a mean lifespan of 27.3 months."},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"a) Find a 95% confidence interval for the population mean of all rats raised in a laboratory."},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"b) What can we assert with 95% confidence about the possible size of our error if we estimate the mean lifespan of all laboratory rats to be 27.3 months?"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"c) How large a sample is needed if we wish to be 95% confident that our sample mean will be within 3.5 months of the true mean?"},{"insert":"\n"}]}
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